this is where I came in—
1. this is where I had to do my part:
- The facilities they have must be maintained and improved, so this is where I came in to help out.
2. my knowledge dates from this point:
- “Anything else you want to ask me?” “No. This is where I came in. Tomorrow we’ll go call on a few people who may have a few answers.”
where do I come in—in what position am I under the circumstances; what part do I have to play:
- You ask me to work in your firm; but where do I come in and what are my duties?